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Minerva Ortopedica e Traumatologica 2002 September;53(3):151-6

Copyright © 2002 EDIZIONI MINERVA MEDICA

language: Italian

The role of hydroxyapatite in improving pin stability and decreasing risk of infection

Moroni A., Vannini F., Romagnoli M., Pegreffi F., Giannini S.


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The purpose of this manuscript is to review the techniques for optimizing the interface between the bone and pin to minimize pin mobilization and infection. The recent literature on bone-pin fixation improvement is reviewed. This paper reports different materials and methods described by various authors and their results. Among the different techniques to improve bone-pin fixation, coating the pins with hydroxyapatite (HA) proved to be the most effective. Three groups of seven patients had external fixation of mid-diaphyseal tibial fractures using uncoated pins, uncoated bicylindrical pins, and hydroxyapatite-coated bicylindrical pins, respectively. All fractures were fixed with six pins, and all fractures united. Both types of stainless steel pins showed a lower extraction torque than insertion torque in all cases, whereas the mean extraction torque in the hydroxyapatite coated pins was unchanged. In a clinical study evaluating bone-pin interface, at 10,000 times magnification direct bone pin contact was found only in hydroxyapatite-coated pins. These studies show that in hydroxyapatite-coated pins there is no deterioration of the bone-pin interface strength and there is optimal bone-pin contact.

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